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A beam of unpolarised light of intensity I 0 is passed through a polaroid A and then through another polariod B which is oriented so that its principal plane makes an angle of 45º relative to that of A. The intensity of the emergent light is -

1. 4 I 0
2. 8 I 0
3. I 0
4. 2 I 0

Correct answer: 4 I 0

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